Electric motor and dynamo machine



July 17, 1928. 1,677,433 C. L. DAUN ELECTRIC MOTOR AND DYNAMO MACHINE Filed Jan. 26, 1928 3 Sheets-Sheet l July 17, 1928. 1,677,433 c. L. DAUN ELECTRIC MOTOR AND DYNAMO MACHINE Filed Jan. 26, 1928 3 Sheets-Sheet 2 July 17, 1928. 1,677,433 C. L. DAUN ELECTRIC MOTOR AND DXNAMO mcnm:

Filed Jan. 26, 1928 3 Sheets-Sheet 3 Patented July 17, 1928.

UNITED STATES 1,677,433 PATENT OFFICE.

CARL L. DAUN, 0F MILWAUKEE, WISCONSIN, ASSIGNOR TO SILCOCK AIRADIATOR CORPORATION, OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

' ELECTRIC MOTOR AND DYNAMO' MACHINE.

4 I This invention relates to certain new and useful improvements in electric motors and dynamo machines and has as a primary object the provision of means whereby motors now in use may be readily converted to motors of the fully closed type, or may at the time of their manufacture have their stator and rotor windings and air gap fully and completely enclosed without changing the external dimensions of the motor, without decreasing their rating, efiiciency or horse-power rating per pound and Without increasing the temperature rise.

In rating electric motors and dynamo machines the mass of active or electrical material governing the horse-power per pound, is directly proportionate to the ability to dissipate the heat generated. up to a .point where decreased efficiency occurs; therefore, it is essential that the live parts of the motor be left clean and closed olf from the surrounding atmosphere for protection against dirt and other foreign material and .to increase ventilation to prevent the motor from being clogged.

\Vithout external direct ventilation this has .been accomplished only at the cost of a large decrease in horse-power per pound of both active and inactive material occas'ioned by the mechanical design necessary to dissipate the heat, which requires rela* tively liberal dimensions and the use of more active or electrical material.

Consequently users have evaded motors of the fully enclosed type with their attendant large mass for the horse-powerdelivery and general inefiiciency and have, where possible, used the open type motor resorting to frequent cleaning and repairing so that their operation would not be too serious-lyimpaired. This invention has as an object the provision of improved means whereby any type of open motor may be readily converted into a fully enclosed motor with its live parts totally protected against dust and dirt without in any way interfering with its efiiciency or horse-power rating or its ability to dissipate heat generated during operation.

This invention has as another object the provision of an enclosing member connected with the rotor of a motor to enclose its live parts from the surrounding atmosphere, which member. is so constructed as to have a large surface area over which acooling current of air moves at high velocity whereby the heat generated by the motor is thermally conducted through said member and dissipated by the current of air passing over the same'..

It is another object of this invention to provide an improved enclosing member for the live parts of an electric motor and dynamo' machine which is radially fluted or pleated to provide a large surface area and a plurality of radially extending channels acting .as an impeller causing a current of cooling air to be passed over the member at a high velocity.

It isa further object of this -invention to provide a motor enclosing and cooling member for electric motors and dynamo machines which is formed of metal having a relatively high degree of thermal conductivity and so formed asto be positioned uxtapose and in thermal contact with the live parts of the machine whereby the heat generated thereby during operation has sufficient radiating capacity to thermally conduct heat through the member to be carried oil by the cooling current of air passing over its outer surface.

And a still further object of this invention resides in the provision of a cooling and enclosing member for electric motors and dynamo machines andthe method of formlng the same in which the member is formed from metal having relatively high thermal conductively and fluted to provide radial passages and a large surface area and having a hub member cast-onto the periphery of a central aperture in the member.

With the above and other objects in view which will appear as the description proceeds, my invention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described and more particularly defined by the appended claims, it being understood that such changes in the precise embodiment of the herein disclosed invention may be'made as come within the scope of the claims.

In the accompanying drawings, I have illustrated several complete examples of the physical embodiment of my invention constructed according to the best modes I have so. far devised for the practical application of the principles thereof, and in which:

Figure 1 is a perspective view of an electric motor and dynamo machine equipped with my improved invention, parts thereof being broken away and in section;

Figure 2 is. a perspective view of my imroved rotating cooling and enclosin' memer, detached fr om the motor and ynamo machine;

Figure 3 is an enlarged, detailed sectional view, taken through Figure 1 on the plane of the line 33 and illustrating the manner in which a flange on the rotating member extends over the stator enclosing sleeve to completely enclose the live parts of the mac lne;

Figure 4 is a longitudinal, sectional view, with parts in elevation, taken through an electric motor and dynamo machine equipped with my invention;

Figure 5 is an enlarged, fragmentary view, partly in section and partly in elevation, taken through a slightly modified form of rotating cooling and enclosing member;

Figure 6 is a view similar to Figure 5 of a further modified form of my invention;

Figure 7 is a view similar to Figures 5 and 6 illustrating a still further modified form of my invention; and i Figure 8 is an enlarged fragmentary view, partly in sectiorband partly in elevation, similar to Figure 3 illustrating a still further modification of my invention.

Referring now more particularly to the accompanying drawings in which like numerals designate like parts throughout the several views, 5 designates an electric motor and dynamo machine of any conventional design and construction having a stator 6 including a core 7 provided with windings 8 and a rotor 9 fixed to a shaft 10 journaled in the bearing members 11 of end members 12 which, with frame members 13, enclose and hold the parts together in a unitary structure. In conventional structures, the parts of the motor are cooled by air entering the spaCesl l between the spider arms 15 supporting the bearing members 11 and being expelled through outlet openings 16 in the members 13 about the stator core 7, this being a conventional open type electric P motor and dynamo machine.

Frequently the shaft 10 carries an air impeller of any conventional design in order to increase the velocity of the air assing through the machine for cooling and in the application of my improved device, the air impellers are-removed and replaced by members 17 of novel design as will be later described. In that embodiment illustrated in Figures 1 to 4, the members 17 each eonsist of a hub portion 18 and an approximately disc shaped member 19 which is fluted or pleated radially and suitably secured to the hub with a lateral annular flange 20 extending from its periphery to overlie a sleeve or cylinder 21 secured to the frame 13, as at 22, see Figure 3, and extendingoutwardly to a point adjacent the outermost ends of the coils 23 of the windings 8.

The member 17 is preferably secured to the rotor by having its hub bolted or otherpreferably constructed of metal having a relatively high degree of thermal conductivity and the flange 20 is soldered, welded or otherwise secured to the outer periphery of the pleated portion 19', the hub 18 being cast, welded or otherwise secured thereto,

thus forming a very rigid construction, the

pleats providing a series of radially extending channels 25 which impel the air at a high velocity in the direction of the arrows shown in Figure 4. A suitable clearance is rovided between the flange 20 and the cylinders 21 and foreign matter is prevented from entering the live parts of the machine by the current of air as will be readily apparent. The pleats or flutes of the member 17 provide a large surface to assure a maximum of cooling area within a minimum diameterand as the member is in close proximity to the source of heat, the current of air which passes over the member causes the thorough and eflicient dissipation of the heat generated by the machine in operation and thermally conducted through the member.

The conventional form of cooling member 17 is as illustrated in Figures 1 to 1, inclusive, but it may be varied without departing from the spirit of the invention and in Figure 5 the flange 20 has its leading or outer peripheral edge curved inwardly, as at 26, and there connected with the portion 19.

In Figure 6. the portion 19 extends transversely i from the hub for a redetermined distance, as at 27 is then inclined outwardly and upwardly, as at 28, and again directed laterally in a parallel plane to the ortion 27, as at 29, having the flange 20 connected to the periphery of the portion 29 in the manner illustrated In this construction the portions 27, 20 and 29 are correspondingly fluted or pleated so that the radial grooves are continuous.

In Figure 7 the construction is identical with that illustrated in Figures 1 to 4, with the exception that the member is not dished inwardly and this construction is designed for installations where limited space does not make it feasible to extendthe member 17 inwardly of the plane of the outer ends of the windings.

In the modification shown in Figure 8-, the clearance between the ends of the windings 8 and the end pieces 12 of the machine to p is such as to prevent the installation of a structure as illustrated in Figure 4 and in this form of my invention the sleeve orcylinder 21 has its outer peripheral edgecurved outwardly, as 'at 33 to provide a trough 35 into which a short lateral flange formed on the end of-Qthe membcr-l7 in place of the flange 20, extends. The outer face of the member 17 is slightly inwardly of the outerplane of the curved portion 30 of the sleeve or cylinder 21 so. that moisture and foreign matter deposited on the cylinder will fall free of the member 17 and prevent its entrance into the interior of the machine during eriods of idleness.

'From the oregoing (lGSCI lPtlOILtHlCOXI in connection with the accompanying drawings, it will be readily apparent to those skilled in the art to which an invention of the character described appertains, that I have-pro vided a highly improved and novel electric motor and dynamo machine which is fully enclosed and which has the same horse- 'power rating per pound as motors of the open type and further that -I- provide improved means whereby any open type motor may be readily converted into a fully en- .closed type without in any way impairing its eflicien y. Y

\Vhat I claim as my invention is: 1. In an electric motor and dynamo machine including a rotor and a stator; means protecting the live parts of the machine from contact with extraneous matter in the at mosphere and includinga pleated member rotatable with the'rotor, the-pleats of said member providing a relatively large air contact surface to insure the dissipation therethrough of heat generatedby the machine.

2. In an electric motor and dynamo machine including a rotor and a stator, cooling means for dissipating heat generated by the machine and including an enclosing member rotatable with the rotor and having irregular surfaces to provide a large surface area over which a current of cooling air passes, said member being of substantially uniform thickness throughout and maintaining the cooling air out of contact with the live parts of the machine.

3. In an electric motor and dynamo-machine including a rotor and a stator, means partly enclosing the stator and over the exterior surface of which a current of cooling air is adapted to be passed, a member rotatable with the-rotor and cooperating with said means to protect the live parts of the machine from contact with extraneous matter in the cooling air, said member being fluted to produce irregular surfaces whereby relatively large surface areas are obtained over which-the'cooling air passes to assure the dissipation of heat generated by the machine and thermally conducted through said member. a 7 ,4. In an electric motor and dynamo machine including a rotor and a stator provided,

Withwindings having coils projecting beyond the rotor,'mcans for protecting the live parts-ofthe mapliine-from contact with extraneous matter in a'current of cooling air -andincluding a memberrotatable' with the rotor and having its medial portion formed tolie in close thermalrelation to therotor inwardly of'the coil outer ends and having an irregular face to provide a large surface area over which the vcurrent of cooling air passes to assure dissipation of heat from the machine thermally conducted through said member, said memberbeing of uniform thickness througho'utthe area of its irregular face.

5. In an electric motor and dynamo machine including a rotor and a stator provided with windings having coils projecting be-' yond the rotor, means for,.inaintaining the.

live parts ofthemachine out fof contact with extraneoris matter in a current of cooling air and including a member rotatable with the rotor and liavingits medial portion formed to lie in close thermal relation to the rotor inwardlyof the coil outer ends, said mem-, her being fluted to produce anirregular face providing alarge surface area'over which the currentof cooling air passes to assure dissipation of heat from the machine thermally conductedthrough said member, and a pcripheral flange directed laterally from said member and extending over-the outer surface of said coils. v

6. In an electric motor anddynamo machine including a rotor and a stator provided 'with windings having coils projecting beloo yond the rotor, means for maintaining the live parts of the machine out of contact with extraneous matter in a current of cooling air andancludm'g a relatively thin walled member rotatable with the rotor and having its medial portion formed to lie in close thermal relation to the rotor' inwardly of the plane of the coil outer ends, said member being fluted to provide alarge surface area over which the current of cooling air passes to assure dissipation ofthe heat from the machine thermallyconducted through said member, a peripheral flange directed laterally from said member and extending over the outer surface of said coils, and a second member cooperating with said'flange-to en-- close the live portions of the motor.

7. A cooling and protecting. member for electric motors and dynamomachines, comprising a hub member, an approximately disc shaped member carried by the hub member and having-radially extending pleats to providea relatively large surface area, and a laterallydirected peripheral-flange carried .by the disc shaped member.

8. In an electricmotor and dynamo machlne Including a rotor and a stator, means partly enclosing the stator. and a member rotatable with-the rotor and having a'clear-- live parts of the machine but of contact with extraneous matter in the surromuling'atmos'phere' and the surface irregularities of the member producing a current of cooling air over its external surface and over the stator enclosing means. 7

9. In an electric motor and dynamo machine including a rotor and a stator, means partly enclosing the stator and a member rotatable with the rotor and' having a clearance with respect to said stator enclosing means. said member being substantially thin walled with surface irregularities providing a relatively -large cooling area, the member and stator enclosing means maintaining the live parts of the machine out of contact with extraneous matter in the surrounding atmosphere and the surface irregularities ofthe member producing a current of cooling air over its external surface and over the statorenclosing means, the velocity of the cooling air at the. point of clearance between the member and the stator enclosing means preventing the entrance of extraneous matter through the clearance between the stator enclosing means and the rotor carried member.

. 10. In an electric motorand dynamo machine having a rotor and a stator, means for protecting the live parts of the machine from contact with extraneous matter suspended in the atmosphere surrounding themaehine and for dissipating the. heat generated by operation of the machine and including a member having relatively high thermal conductivecharacteristics, and radially extending pleats formed in said member to produce this on both sides thereof without increasing its thickness at any point, said pleats )roviding a relatively large cooling sur ace, said member being positioned between the surrounding atmosphere and the live parts of the machine to prevent the cooling air from coming into contact with the-live parts of the machine.

tecting the live parts of the machine, the

flutes of the disc providing large internaland external cooling surface areas for dissipating the heat of the machine.

13.111 a protecting device for an electric motor and dynamo machine including a ro-' torjand a stator, a hub member connectable with the rotor of the machine to turn therewith. a fluted member rigid with thehub member and protecting the live parts of the machine agamst contact with extraneous matter in the surroundin atmosphere, and a peripheral flange CXtOIlC ed laterally from the fluted member.

14. In. aprotecting device for an electric motor and dynamo machine including a rotor and a stator, ahub member connect'ablc with the rotor of the machine to turn there with, a fluted member rigid witlrthe' hub member, a peripheral flange extended laterally from the fluted member, and a stationary member adapted to be disposed OWSI. the

stator of the machine and cooperating with I the fluted member and flange whereby the live parts of the machine are protected from contact with extraneous matter in the surrounding atmosphere.

15. A protecting device for an electricmotor and dynamo machine, comprising a mounting member, and a fluted substantially conical shaped member carried by the mount ing member. the flutes of the second member forming internal and external surface irregularities to provide relatively large internal and external cooling surface areas.

16. A device for converting astandard open type electric motor and dynamo machine including arotor and a stator into a fully enclosed type nnfchine with its live parts shielded from extraneous matter in the surrounding atmosphere, and comprising means securable over one end of the live parts of the machine and including a member rota-table with the rotor and having internal and external surface irregularities and of substantially uniform thickness throughout its irregular surfaces to afford relatively large internal and external cooling surface areas.

17. A device for converting a. standard open type electric motor anddynamo machine including a rotor and a stator'into a fully enclosed type machine with its live parts shielded from extraneous matter in the surrounding atmosphere, and comprising means securahle over one end of the live parts of themachine and including a member rotatable with the rotor and having internal and external surface irregularities to afford relatively large internal and external cooling surface areas, said member being of substantially uniform thickness throughout its 'irregular'surfaces, and a second member adapted to be disposed over the stator and cooperating with the first member.

'18. A device for converting a standard open type electric motor anddynamo machine including a rotor and a stator into a fully enclosed type machine with itslive parts shielded from extraneous matter in the {surrounding atmosphere, and comprising a a hub member eonnectable w th the rotor to turn therewitlnand a substantially conical shaped fluted member carried by the hub member and positioned to protect the live parts of the machine, said flutes forming irregular internal and external cooling sur- I faces of relatively large area.

19. In an electric motor and dynamo machine including a rotor and a stator, a sta- -'tionary part having anannular trough, a

fluted member rotatable with the rotor and protecting-the live parts of the machine from extraneous matter in the surrounding atmosphere,the flutes ofsaid member forming in- V ternal and external surface irregularities to provide relatively large internal and external cooling areas, and an annular flange carried bv the fluted member adjacent its'periphery and extended into sald annular trough.

. 20. In an electric motor and, dynamo machine ncluding a rotor and a stator having windings, theends of which'project beyond the rotor, a stationary sleeve extended over the ends of the windings and having an annular channel concentric with respect to the rotor, a fluted member rotatable with the rotor, the flutes of said member forming in- 1 ternal and externalsurface irregularities to provide relatively large internal and external cooling areas, and an annular flange carried by the fluted member and extended into the I 0 1a regularities to prov1de relatively large in- ,ternal and external cooling areas, and an annular flange carried by one of saidmembers and extended into an annular channel in the other member, whereby said. members substantially enclose the live parts of the machine to protect the same from extraneous matter in the surrounding atmosphere.

In, testimony whereof I have hereunto affixed my signature. 7

- CARL L. DAUN. 

